(()=>{
 interface Iperson {
  firstName:string
  lastName:string
 }
   class Person {
    firstName:string
    lastName :string
    fillNmae:string
    constructor(firstName:string,lastName:string, fillNmae:string){
     this.firstName = firstName
     this.lastName = lastName
     this.fillNmae = fillNmae
    }
   }
   function showFillName(person:Iperson){
    return person.firstName + person.lastName
   }
   const person = new Person('张三','李四','王五')
   console.log(showFillName(person));
})()